Answer:
D.) Mountain men had a favorable view of American Indian culture and adopted some of its customs.
Step-by-step explanation:
Mountain men were men who lived in the wilderness, particularly in the North American Rocky Mountains from 1810 to the 1880s. Mountain men understood the difficulties of surviving in these areas, and because of this, they generally tried to learn the practices of the Native American people of the region. Mountain men were instrumental in allowing American settlers to reach the territories of the far West.